Fix runtime namespace graphing.
Tidied graph viewer window titles.
Added a new test for namespacing graphing.
Removed a comment.
Removed the old checkvars utility from the CLI.
Merge pull request #1162 from hjoliver/1160.remove-checkvars-util

Removed the old checkvars utility from the CLI.
Merge pull request #1161 from hjoliver/bug-fix.namespace-graphing

Fix namespace graphing
Fixed a command help typo.
Adds a refresh button to the "cylc graph" viewer.

Removes automatic load after modifying the suite.rc file.
Merge pull request #1163 from hjoliver/graph.refresh-button

Adds a refresh button to the "cylc graph" viewer.